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NFC. Introduce Value::isPointerDereferenceable

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Extract a part of isDereferenceableAndAlignedPointer functionality to Value:
    
Reviewed By: hfinkel, sanjoy
    
Differential Revision: http://reviews.llvm.org/D17611

llvm-svn: 269190
This commit is contained in:
Artur Pilipenko
2016-05-11 14:43:28 +00:00
parent 610a4e916e
commit 7a26326442
3 changed files with 34 additions and 12 deletions
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23
llvm/lib/IR/Value.cpp
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@@ -559,6 +559,29 @@ unsigned Value::getPointerDereferenceableBytes(bool &CanBeNull) const {
return DerefBytes;
}
bool Value::isPointerDereferenceable(bool &CanBeNull) const {
assert(getType()->isPointerTy() && "must be pointer");
CanBeNull = false;
// These are obviously ok.
if (isa<AllocaInst>(this))
return true;
// Global variables which can't collapse to null are ok.
// TODO: return true for those but set CanBeNull flag
if (const GlobalVariable *GV = dyn_cast<GlobalVariable>(this))
if (!GV->hasExternalWeakLinkage())
return true;
// byval arguments are okay.
if (const Argument *A = dyn_cast<Argument>(this))
if (A->hasByValAttr())
return true;
return false;
}
unsigned Value::getPointerAlignment(const DataLayout &DL) const {
assert(getType()->isPointerTy() && "must be pointer");